A patient is prescribed Flexeril (cyclobenzaprine) for muscle spasms. Which of the following is the most common side effect that the nurse should educate the patient about?

Choice A reason: This is incorrect. Polydipsia is excessive thirst, which is a symptom of hyperglycemia (high blood sugar), not hypoglycemia (low blood sugar). People with hyperglycemia lose fluid through frequent urination and become dehydrated, which makes them thirsty.

Choice B reason: This is correct. Shaking is a common sign of hypoglycemia. It occurs because the body releases adrenaline and other hormones to raise blood sugar levels. Adrenaline causes the muscles to tremble or shake.

Choice C reason: This is correct. Confusion is another common sign of hypoglycemia. It occurs because the brain does not get enough glucose, which is its main source of energy. Low blood sugar can impair cognitive functions, such as memory, attention, and judgment.

Choice D reason: This is incorrect. Tachycardia is a rapid heart rate, which can be a symptom of both hypoglycemia and hyperglycemia. However, it is not a specific or reliable indicator of low blood sugar, as it can also be caused by other factors, such as stress, anxiety, caffeine, or medication.

Choice E reason: This is incorrect. Polyuria is excessive urination, which is another symptom of hyperglycemia, not hypoglycemia. People with hyperglycemia have high levels of glucose in their blood, which draws water from the cells and increases urine output.

Choice A reason: Vasodilation is not the primary therapeutic effect of atropine in this scenario. Atropine is a medication that blocks the action of acetylcholine, a neurotransmitter that stimulates the parasympathetic nervous system. Atropine can cause vasodilation by inhibiting the muscarinic receptors on the blood vessels, which normally cause vasoconstriction. However, this effect is not significant or consistent, and it does not improve the symptoms of bradycardia, which is a slow heart rate that can cause dizziness, fatigue, or fainting. The nurse should monitor the blood pressure and the peripheral pulses of the patient after administering atropine.

Choice B reason: Bronchodilation is not the primary therapeutic effect of atropine in this scenario. Atropine is a medication that blocks the action of acetylcholine, a neurotransmitter that stimulates the parasympathetic nervous system. Atropine can cause bronchodilation by inhibiting the muscarinic receptors on the bronchial smooth muscle, which normally cause bronchoconstriction. However, this effect is not relevant or beneficial for the patient with symptomatic bradycardia, who does not have any respiratory problems. The nurse should assess the respiratory rate and the breath sounds of the patient after administering atropine.

Choice C reason: Increase in heart rate is the primary therapeutic effect of atropine in this scenario. Atropine is a medication that blocks the action of acetylcholine, a neurotransmitter that stimulates the parasympathetic nervous system. Atropine can increase the heart rate by inhibiting the muscarinic receptors on the sinoatrial node and the atrioventricular node, which normally slow down the heart rate. This effect is desirable and beneficial for the patient with symptomatic bradycardia, who has a slow heart rate that can cause dizziness, fatigue, or fainting. The nurse should monitor the electrocardiogram and the heart rate of the patient after administering atropine.

Choice D reason: Diuresis is not the primary therapeutic effect of atropine in this scenario. Atropine is a medication that blocks the action of acetylcholine, a neurotransmitter that stimulates the parasympathetic nervous system. Atropine can cause diuresis by inhibiting the muscarinic receptors on the bladder, which normally promote urination. However, this effect is not important or helpful for the patient with symptomatic bradycardia, who does not have any urinary problems. The nurse should measure the urine output and the specific gravity of the patient after administering atropine.